linux-kernel - Re: [patch 01/26] mount options: add documentation

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Message-ID: <20080130144204.GZ6922@petra.dvoda.cz>
Date:	Wed, 30 Jan 2008 15:42:04 +0100
From:	Karel Zak <kzak@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	zippel@...ux-m68k.org, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	sfrench@...ibm.com, lachlan@....com, jsipek@...sunysb.edu,
	rmk@....linux.org.uk, dhowells@...hat.com, raven@...maw.net,
	rathamahata@...4.ru, kkeil@...e.de, hpa@...or.com, tytso@....edu,
	hirofumi@...l.parknet.co.jp, jdike@...toit.com,
	mikulas@...ax.karlin.mff.cuni.cz, wli@...omorphy.com,
	shaggy@...tin.ibm.com, vandrove@...cvut.cz,
	Trond.Myklebust@...app.com, jeffm@...e.com, paulus@...ba.org,
	hugh@...itas.com, gorcunov@...il.com, gregkh@...e.de
Subject: Re: [patch 01/26] mount options: add documentation

On Wed, Jan 30, 2008 at 10:09:03AM +0100, Miklos Szeredi wrote:
> > - loop: how is the connection between file and loop device maintained?
> 
> We also discussed this with Karel, maybe it didn't make it onto lkml.
> 
> The proposed solution was to store the "loop" flag separately in a
> file under /var.  It could just be an empty file for each such loop
> device:
> 
>   /var/lib/mount/loops/loop0
> 
> This file is created by mount(8) if the '-oloop' option is given.  And
> umount(8) automatically tears down the loop device if it finds this
> file.

 It seems we needn't this solution. There is loop auto-destruction
 patch in -mm.

 Kernel part:
    http://marc.info/?l=linux-kernel&m=119361296818388&w=2

 mount(8) part:
    http://marc.info/?l=util-linux-ng&m=119362955431694&w=2

 So, with this patch mount(8) needn't to maintain info about loops and
 umount(8) doesn't need to call LOOP_CLR_FD ioctl, because umount(2)
 is enough.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
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